Cutting-off tool and holder



July 18, 1944. J. M. LUERS CUTTING-OFF TOOL AND HOLDER Filed April 5, 1943 3 Sheets-Sheet [-51 INVENTOR 757) Ming rs J. M. LUERS CUTTING-OFF TOOL AND HOLDER July 18, 1944.

Filed April5, 194's 5 Sheet-Sheet 2 INVENTOR 4 7050 fizzle (s July 18, 1944 I LUERS 2,353,913

' CUTTING-OFF TOOL AND HOLDER Filed April 5, 1943 5 Sheets-Sheet 3 INVENTOR Patented July 18, 1944 GUTTINGHOFF TOOL AND HOLDER John M. Luers, Mount Clemens, Mich., assignor 'to John Milton Luers Patents Incorporated, Detroit, Mich., a corporation of Michigan Application April 5, 1943, Serial No. 481,849

9 Claims.

This invention relates to improvements in cutting-off tools and holders, and refers to tools and holders which may be employed for parting work of quite large diameters. In order to support a tool under such circumstances, aiford it ample rigidity, and reduce its overhang to a minimum, I provide a tool the width of which across its cutting edge is slightly greater than that of the front of the holder with the rear portion of the tool attached thereto, so that as the depth of the cut increases the holder may follow the tool into the cut thereby reducing its overhang, and at the same time though the holder is narrow it may be made as deep as necessary to provide the required rigidity.

Another object of the invention is to provide such a tool and holder wherein dual means are provided for retaining the tool, whether straight or substantially circular, immovable in the holder; and wherein one of the means consists of teeth formed upon one margin of the tool which coact with a locking pinion carried by the holder and which may be held immovable thereon.

A further object of the invention is to provide such a tool and holder wherein the locking pin may be radially split, and means for expanding the split pinion which is then brought into intimate contact either with the tool teeth or which may engage the wall of a counterbore in the holder, or both, for insuring that the tool and pinion remain immovable- Still another object of the invention is to provide such a tool and holder wherein the latter is made in two parts the contacting faces of which are vertically serrated so that one member may be set to project varying distances forwardly from and at various heights relative to the other; and wherein the two parts have elongated slots formed through them which extend at right angles to one another, so that fastening means may be inserted through both slots to secur the two parts to one another at various relative positions.

Having thus briefiy stated some of the objects and advantages of the invention I will now proceed to describe it in detail with the aid of the accompanying drawings, in which:

Figure 1 illustrates a plan view of the inventionincluding a substantially circular tool mounted in the holder.

Figure 2 is a side View on the line 2-2 of Figure 1.

Figure 3 is a plan view partly in section showing .a slightly modified arrangement.

Figure 4 is a plan View, partly section, showing another slight modification.

Figure 5 is a partial sectional view showing another modified form of locking pinion mount- Figure 6 shows another modified arrangement of the pinion mounting partly in section, and

Figure 7 is a partial side view of Figure 6.

Figure 8 is a side view showing a modification wherein a straight tool is mounted in the holder,

and

Figure 9 is a plan view of Figure 8.

Figure 10 is another modification showing a straight tool engaged by a slightly differently mounted locking pinion.

Referring first to Figures 1 and 2, I designates a substantially circular tool centrally apertured at 2 for the passage of a suitable fastening means such as the screw 3 therethrough by which it is secured to a supporting member 4 of a holder which also includes a shank 5. A notch 6 is formed in the tool I, whereby a portion of its circumference is removed, and extending from the flat edge face to of the notch around a portion of the remaining circumference of the tool is an arcuate head I of increased width having a preformed cutting surface 8 formed lengthwise of its outer edge face. The opposite sides of the head 1 are outwardly tapered toward the cutting surface 8 so that the latter is thewidest part of the tool and is wider than the supporting mem her 4 including the rear of the tool I which is attached thereto and in such manner that it does not project beyond the sides of the said member. Consequently as the depth of the cut indicated at A increases in the work B, both the tool I and the member 4 may pass freely thereinto. Across the junction of the extremity of the cutting surface 8 with the outer extremity of the flat edge face 6a a cutting edge 9 is formed so that as the tool wears it may be dressed and sharpened by grinding the said fiat edge face which is substantially radially disposed to the work. Formed around the remainder of the circumference of the tool which is narrower than the head I are teeth [0 arranged in the form of a partial gear.

Secured as by a screw II in engagement with the supporting member 4 is a radially split locking pinion l2 the teeth of which engage the teeth In of the tool. The screw has a tapered head which engages a countersunk end of the bore of the pinion l2 so that as the screw is tightened the pinion is not only held frictionally against one side of the member 4, but as the pinion is seated in a partial counterbore 4b the pinion is also expanded so that its teeth engage the wall of the latter thereby insuring that the pinion l2 and consequently the tool I remain immovable. In this instance it will be noted that the front portion 4a of the member which supports the tool is narrower than its rear portion one side of which projects laterally beyond the tool.

To support tools intended to part work of very large diameters the member 4 may be made as deep as required, as indicated at 40, to provide necessary rigidity. So that ample adjustment of the tool and holder may be had a, shank 5 is attached to one side of the supporting member 4,

and the coacting faces of these two parts are vertically serrated to assist in holdin them relative to one another. Formed through the shank and member are elongated slots l4 and I5 respectively which extend at right angles to oneanother. Through both these slots a fastening means such as the bolt l6 extends so that they may be secured together after the desired adjustment of these parts relative to one another has been made,

In the modification shown in Figure 3, the arrangement is very similar but the lockin pinion I2, which in this instance need not be split, has teeth the length of which increases toward the outer side of the pinion, so that as the said pinion is forced inwardly by the screw it some of the teeth are forced into binding engagement with the teeth H] of the tool, and at the same time the head of the screw holds the pinion frictionally against the supporting member 4.

In the modification shown in Figure 4, the supporting member 401 which is of uniform thickness throughout its length is centrally slotted at 4e from one extremity to receive the narrower portion of the tool I. The split locking pinion l2 has a tapered bore to receive an axially movable bushing 20 which is forced inwardly by tightening the screw I l. The latter extends through the bushing and is in threaded engagement with the opposite side of the supporting member.

In the modification shown in Figure 5 an internally threaded straight bushing 20a extends almost completely through the supporting member 4d which is again centrally slotted at 4e to receive the tool I and the pinion l2. One extrem ity of the bushing is of increased diameter at 23?) to limit its movement through the supporting member. The pinion I2 is mounted upon the bushing 20a and in threaded engagement with the bore of the latter is the screw ll. As the latter is tightened the end [21) of the bushing is drawn inwardly and with it one side of the memberfid. At the same time the enlarged head of the screw ll forces the opposite side of the said member inwardly thereby firmly engaging the pinion between these sides, To increase the resilien-ce of these sides of the supporting member a second narrow slot 4 extends inwardly from the base of the slot 4e. This arrangement provides ample length of thread in the bushing 20a and on the screw ll even for quite narrow holders.

In the modification shown in Figures 6 and 7, the supporting member 411 is again centrally split at ie from its front extremity to receive the tool I, and the bore of the radially split locking pinion i2 is longitudinally tapered and threaded to receive a correspondingly tapered screw ll so that as the latter is tightened the pinion is expanded into binding engagement with the teeth I 0 ofthe tool to hold the latter immovable about the screw 2,353,913 7 I QC.

ber to extend partly over the outer faces of the pinion. These discs 22 are held in spaced relation as shown by the rivet 23 which extends through the member 411.

In the modification shown in Figures 8 and 9 a straight tool 3| is provided which has a head 32 of increased width along one longitudinal margin and a cutting edge 33 formed lengthwise of the outer edge face of the head. The latter is wider than the supporting member 34 with the body 35 of the tool secured thereto so that the said member may freely enter the work as the cut proceeds. The opposite sides 36 of the head 32 are realwardly and inwardly tapered from the cutting surface 33, and. formed across one extremity of the latter at its junction with a fiat edge face 31 extending across one end of the tool is a cutting edge 38. Formed longitudinally on one side of the body 35 is a groove 39.

The supporting member 34 is centrally slotted from the front at 40 to receive the body 35 of the tool and integral with the member and projecting into the slot 40 from one side is a key 4| which is engaged by a groove 39 to control the path of movement of the tool 3i relative to the supporting member 34. Formed upon the rear edge face of the tool body 36 are teeth 42 arranged in the form of a rack.

Mounted in the slot 40 upon the screw 43 extending through opposite sides of the supporting I member 34 and in threaded engagement with one of them is a locking pinion 44 which engages the teeth 42. Extending from the base of the slot 40 is a narrower slot 45 to increase the resilience of the sides of the supporting member 34 so that when the screw is tightened the pinion 44 is held immovable between them. In the modification shown in Figure 10, the arrangement is very similar to that just described, the teeth 42 upon the tool 3| are again engaged by the pinion 44 which in this instance is split radially. The bore of the pinion is tapered to receive a corresponding bushing 48 which is internally threaded to receive the screw 43 so that as the latter is tightened not only are the opposite sides of the supporting member 34 drawn together since one extremity of the bushing is of increased diameter and cannot pass through the member, but the movement of the bushing in one direction also expands the locking pinion and forces its teeth into intimate contact with the teeth 42 of the tool 3 I.

What I claim is: a

l. A cutting-01f tool including a body having ahead extending along one edge, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being of increased width from the body and widest across its cutting surface, and teeth formed on the edge of the body opposite the head, in combination with-a supporting member, means holding the body immovable on the latter including a locking pinion carried by said member, and means forhol-ding the locking pinion immovable.

2. A cutting-off tool including a body having a head extending along one edge, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being widest across the cutting surface and decreasing in width toward the body, and teeth formed on the edge of the body oppositethe head, in combination with a supporting member; means holding the tool immovable onthe latter including" a radially split locking pinion carried by said member, and means for expanding the pinion to hold the tool immovable.

3. A straight tool including a body and a head extending along one side thereof, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being of increasing width from the body and widest across its cutting surface, and teeth in the form of a rack upon the face of the body opposite the head, in combination with a supporting member, meansfor securing the body to the member including a locking pinion meshing with the teeth, and means for holding the locking pinion immovable on the supporting member.

4. A substantially circular tool including a body and an arcuate head extending around part of its periphery, a preformed cutting surface on the outer edge face of the head, a cutting surface formed across one extremity of the cutting surface, the head being of increasing width from the body and widest across its cutting surface, and teeth formed on the periphery of the body opposite the cutting surface, in combination with a supporting member, means for securing the body on the supporting member including a locking pinion thereon meshing with the teeth, and means for holding the pinion immovable on the supporting member.

5. A straight tool including a body and a head extending along one side, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being of increasing width from the body and widest across the cutting surface, a groove formed in one side of the body parallel with the cutting surface, and teeth in the form of a rack upon the face of the body opposite the head, in combination with a supporting member centrally slotted from its front extremity to receive said body, a projection in said body extending into said slot and seated in said groove, a locking pinion meshing with said teeth, and means for holding the pinion immovable on said member.

6. A substantially circular tool including a body and an arcuate head extending around a portion of its periphery, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being progressively of increasing width from the body to the cutting surface, and teeth in the form of a partial gear formed on the body periphery opposite the head, in combination with a supporting member, means supporting the tool centrally on the member for rotation thereon, a locking pinion meshing with the teeth, and means carried by the member for holding the pinion immovable.

7. A toolholder including a supporting member, means on the member for holding a tool immovab-le thereon, said member being serrated across one side for a portion of its length and having an elongated slot formed therethrough, a shank having one side serrated to engage the member serrations, said shank having an elongated slot formed therethrough at right angles to the supporting member slot, and means extending through both slots for securing the member to the shank.

8. A tool holder including a supporting member extending forwardly beyond a shank, said member being serrated across one side for a portion of its length and having an elongated slot formed therethrough, the shank also having serrations across one side coacting with the member serrations and an elongated slot therethrough extending at right angles to the supporting member slot, and means extending through both slots for securing the member to the shank when the member projects different distances forwardly from and is positioned at different elevations relative to said shank, in combination with a tool, and means on the member for holding the tool immovable thereon.

9. A cutting-off tool including a body having a head extending along one edge, a preformed cutting surface on the outer edge face of the head, a cutting edge formed across one extremity of the cutting surface, the head being of increased Width from the body and. Widest across its cutting surface, and teeth formed on the edge of the body opposite the head, in combination with a supporting member, means holding the body immovable on the latter including a toothed element carried by the member, and means for holding the toothed element immovable.

JOHN M. LUERS. 

